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Hi Jules, Many thanks for the info. I'll definitely share the KiCad files once I've built and tested it.
Hi Jules, I'd like to re-draw the circuit and PCB in KiCad. Should I use the circuit in the ZIP file with the two zener diodes on the output or use the PDF version with the two 22p capacitors? Also, is there any need to suspend the 1G Resistor/FET Gate connection or can I route it through a connector on the PCB?
Another quick question; Having trouble finding the Zeners in the UK at a reasonable price. Can I use BZX types as substitutes?